Just throwing out my idea here. I've been discussed with DoubleX at TSBS topic in RPG Maker Web about the combination attack. A lot of people bugging me to put this kind of feature in next update. Alright, so here is my idea. I will explain it in user perspective.

To do the combo attack, you need to select the same skill in different battler. I think that's is the easiest way. And also you can do something like this.

Actor A uses skill X

Actor B uses skill Y

It's not combination attack, then actor A will perform action sequence XYZ

Actor A uses skill X

Actor B uses skill X

It's combination attack. Then ...

Actor A will perform action sequence ASD

Actor B will perform action sequence QWE

The setting would me like this

Actor notetag

<combo: skill_id, ActionKey>

Skill notetag

<combo>

When the same skill is used by two (or maybe more. This seems need an extra config) battlers, they could perform a combo action.Or, if you want to do something like this. I would change the skill notetag into.

<combo: combo_id>

When all the skills with the same id are used, then combination attack will be performed.

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In case if I forget how combo attack looks like, I could open this topic instead of going through my TSBS topic pages.

Also, I'm not promosing yet, but I'm excited to make the UI version of my battle system. So that you could test the sequence and edit them in game.